Color Puchi is a decent puzzler by PEKPOK, which looks like Pixelus and Guru Logi Champ at first glance but plays quite differently when compared to those two.

The square on the right dictates the pixel arrangement that you have to look for in the picture. Move the target frame around by using the arrow keys and press space when you've found it. There's an option to challenge either the CPU or another player, but the demo only features one level.